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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 1. 创建变量
        let phone = 1351111111;
        let a = 1;
        let b;

        const password = 123;
        const c = 100;

        // 2. 修改变量
        phone = 1351111112;
        a = 11;
        b = 200;

        // c = 500;

        // 3. 输出语句
        console.log(phone);
        console.log(100);




    </script>
</body>

</html>